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Jason 1

Jason-1 is the first follow-on to the highly successful TOPEX/Poseidon mission that measured ocean surface
topography to an accuracy of 4.2 cm, enabled scientists to forecast the 1997-1998 El
Niño, and improved understanding of ocean circulation and its effect of global climate.
The joint NASA-CNES program will launch a French spacecraft on an American Delta-7920-10C from Vandenberg AFB. Like TOPEX/Poseidon, the payload will include both American and
French instruments. Jason-1 altimeter data will be part of a suite of data provided by
other JPL-managed ocean missions - the GRACE mission will use two
satellites to accurately measure Earth's mass distribution, and the QuikSCAT
scatterometer mission will measure ocean-surface winds.